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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 需求"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "```\n",
    "请判断一个链表是否为回文链表。\n",
    "\n",
    "示例 1:\n",
    "\n",
    "输入: 1->2\n",
    "输出: false\n",
    "\n",
    "示例 2:\n",
    "\n",
    "输入: 1->2->2->1\n",
    "输出: true\n",
    "\n",
    "进阶：\n",
    "你能否用 O(n) 时间复杂度和 O(1) 空间复杂度解决此题？\n",
    "```\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 思想"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 实现"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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    "version": 3
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   "pygments_lexer": "ipython3",
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